CN1105687C - High-molecular cationic flocculant of starch graft acrylamide and its preparing process - Google Patents
High-molecular cationic flocculant of starch graft acrylamide and its preparing process Download PDFInfo
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- CN1105687C CN1105687C CN 98122254 CN98122254A CN1105687C CN 1105687 C CN1105687 C CN 1105687C CN 98122254 CN98122254 CN 98122254 CN 98122254 A CN98122254 A CN 98122254A CN 1105687 C CN1105687 C CN 1105687C
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Abstract
The present invention discloses a macromolecular cation type flocculant of starch graft acrylamide and a preparing method thereof. The flocculant of the present invention is composed of the following reacting raw materials: starch or cellulose, acrylamide, formaldehyde, dimethylamine, a catalyst and a solvent. A discharging material can be prepared by graft copolymerization and amination reaction at a certain temperature and in certain time. The flocculant of the present invention, which has the advantages of small using amount, low treating cost and high dewatering efficiency, is particularly suitable for the sludge dewatering treatment of sewage of a city, a brewery, a tannery, a dye plant, a chemical plant, a paper factory, etc.
Description
Technical field
The present invention relates to a kind of flocculation agent and preparation method thereof, more specifically say, relate to a kind of high-molecular cationic flocculant of starch graft acrylamide and preparation method thereof.
Background technology
Industry at present and municipal effluent, the general secondary biochemical treatment that adopts, the mixing sludge concentrating, assimilating, processed technology, guarantee that water quality reaches emission standard and is equipped with, and the important composition microorganism flocs unit of the mud of waste water is electronegative, thereby extensively adopt cation polymeric flocculant as sludge dehydrating agent, dewatering efficiency and filtration velocity are significantly improved, the U.S., the special cation polymeric flocculant exploitation of paying attention to based on polyacrylamide of advanced countries such as Japan, it is to be monomer with the acrylamide, initiator effect solution polymerization makes, but because polyacrylamide price height, the dewatering and filtering effect is also undesirable, so be difficult to be accepted by environmental administration, its use also is greatly limited.
Well-known sludge dehydrating agent requires that consumption is few, processing cost generation, dewatering time is short and efficient is high, it is cotton-shaped greatly by in the adsorption bridging effect of molecule and surface charge neutralizing effect finely divided suspended particle and colloid thing being gathered into that its dewatering Principle is a dewatering agent, thereby solids precipitation speed is being improved greatly, and solution becomes must be clarified.
Summary of the invention
The purpose of this invention is to provide the new cation polymeric flocculant that a kind of consumption is few, dewatering and filtering is effective and cost is low.
Another object of the present invention provides the preparation method of high his the sub-flocculation agent of above-mentioned positively charged ion.
High-molecular cationic flocculant of starch graft acrylamide provided by the present invention is made up of following raw material:
(1) 0.5～1.5% (weight) starch or Mierocrystalline cellulose: selecting fineness for use is 200 to 1000 orders;
(2) 2.0～4.5% (weight) acrylamide: select industry or three grades of reagent for use;
(3) 1.0～2.0% (weight) formaldehyde: industry or three grades of reagent of selecting weight content 30～36% for use;
(4) 1.0～3.0% (weight) dimethylamine: industry or three grades of reagent of selecting weight content 33～40% for use;
(5) 0.1～1.0% (weight) catalyzer: select cerium salt, hydrogen peroxide, potassium permanganate-mineral acid or Potassium Persulphate-sulphite for use;
(6) 75～90% (weight) solvent: select deionized water for use.
Wherein preferably:
The preferred fineness of starch or Mierocrystalline cellulose is 500 orders;
The preferred technical grade of acrylamide;
The preferred technical grade of acryloyl;
The preferred technical grade weight content of formaldehyde is 36%;
The preferred technical grade weight of dimethylamine is 40%;
Preferred potassium permanganate-sulfuric acid of catalyzer or acetate or Potassium Persulphate-sulfurous acid redox catalyst.
Analyzing the polymer dewatering agent from molecular structure generally is the linear structure compound, the big more hydrocarbon chain of molecular weight is long more, contained effective functional group is also many more, secondly on molecular chain, connect different functional groups, thereby can form the adsorption bridging effect and the surface charge neutralizing effect of molecule, thereby reach the high-efficiency dehydration effect.High-molecular cationic flocculant of starch graft acrylamide provided by the present invention meets this constitutional features.
The advantage of high-molecular cationic flocculant of starch graft acrylamide of the present invention is tangible:
1, consumption is few, is generally between sludge concentration 0.1～% (weight).
2, dehydrating effect height mixes to be formed on cotton-shaped walk in 15～20 seconds and to precipitate rapidly with mud, solution becomes must be clarified.
3, cost is low.
The preparation method of high-molecular cationic flocculant of starch graft acrylamide provided by the invention, may further comprise the steps: (1) copolyreaction: 2/3rds of 0.5～1.5% (weight) starch or Mierocrystalline cellulose and 75～90% (weight) solvent added be equipped with in the reactor of whipping appts, potassium permanganate-the sulfuric acid or the Potassium Persulphate-S-WAT catalyzer that add 0.1～1.0% (weight) again reacted 30 minutes down at 40～70 ℃, add 2～4.5% (weight) acrylamide again, keep 40～70 ℃ and continue reaction 2.5～5 hours; (2) aminated reaction: on the basis of copolyreaction, add 1.0～3.0% (weight) dimethylamine, under 40～70 ℃, be reflected at 30～60 minutes, add 1.0～2.0% (weight) formaldehyde again and keep 40～70 ℃ of reactions 1.0～2.5 hours, add 1/3rd of 75～90% (weight) solvent at last and keep and till material stirs, got final product discharging in 30～60 minutes.
Above-mentioned graft copolymerization does not need to carry out under condition of nitrogen gas, directly carries out graft reaction without starch pasting, can make high score amount be higher than 8,000,000 flocculation agent.
To further describe the present invention by embodiment below.
Embodiment 1
It is 25% aqueous solution that 5 gram starch are made into concentration, add and be equipped with in the reactor of whipping appts, adding 0.1% (weight) Potassium Persulphate-S-WAT kept under 70 ℃ 30 minutes, add acrylamide 12 grams again, in 70 ℃ of reactions 3 hours, adding 16.7 gram dimethylamine added 12 gram formaldehyde again and reacted 2.5 hours down in 70 ℃ in 70 ℃ of reactions 1 hour, add at last 249 the gram water keep 30 minutes even to material, promptly finish preparation process.
Embodiment 2
It is 10% aqueous solution that 5 gram starch are made into concentration, add and be equipped with in the reactor of whipping appts, adding 0.05% potassium permanganate-sulfuric acid kept under 70 ℃ 30 minutes, add acrylamide 12 grams again, in 50 ℃ of reactions 5 hours, add dimethylamine 16.7 again and restrain in 50 ℃ of reactions 1 hour, add 12 gram formaldehyde then and under 50 ℃, kept 2 hours, add at last 218 the gram water keep 30 minutes even to material, promptly finish preparation process.
Claims (7)
1, a kind of high-molecular cationic flocculant of starch graft acrylamide, form by following raw material:
(1) 0.5～1.5% (weight) starch or Mierocrystalline cellulose: selecting fineness for use is 200 to 1000 orders;
(2) 2.0～4.5% (weight) acrylamide: select industry or three grades of reagent for use;
(3) 1.0～2.0% (weight) formaldehyde: industry or three grades of reagent of selecting weight content 30～36% for use;
(4) 1.0～3.0% (weight) dimethylamine: industry or three grades of reagent of selecting weight content 33～40% for use;
(5) 0.1～1.0% (weight) catalyzer: select cerium salt, hydrogen peroxide, potassium permanganate-mineral acid or Potassium Persulphate-sulphite for use;
(6) 75～90% (weight) solvent: select deionized water for use.
2, high-molecular cationic flocculant of starch graft acrylamide as claimed in claim 1 is characterized in that: preferred fineness is 500 purpose starch or Mierocrystalline celluloses.
3, high-molecular cationic flocculant of starch graft acrylamide as claimed in claim 1 is characterized in that: preferred technical grade acrylamide.
4, high-molecular cationic flocculant of starch graft acrylamide as claimed in claim 1 is characterized in that: preferred technical grade weight content is 36% formaldehyde.
5, high-molecular cationic flocculant of starch graft acrylamide as claimed in claim 1 is characterized in that: preferred technical grade weight content is 40% dimethylamine.
6, high-molecular cationic flocculant of starch graft acrylamide as claimed in claim 1 is characterized in that: preferred potassium permanganate-sulfuric acid or acetate redox catalyst or Potassium Persulphate-S-WAT redox catalyst.
7, the preparation method of the described high-molecular cationic flocculant of starch graft acrylamide of claim 1, may further comprise the steps: (1) copolyreaction: 2/3rds of 0.5～1.5% (weight) starch or Mierocrystalline cellulose and 75～90% (weight) solvent added be equipped with in the reactor of whipping appts, potassium permanganate-the sulfuric acid or the Potassium Persulphate-S-WAT catalyzer that add 0.1～1.0% (weight) again reacted 30 minutes down at 40～70 ℃, add 2～4.5% (weight) acrylamide again, keep 40～70 ℃ and continue reaction 2.5～5 hours; (2) aminated reaction: on the basis of copolyreaction, add 1.0～3.0% (weight) dimethylamine, under 40～70 ℃, be reflected at 30～60 minutes, add 1.0～2.0% (weight) formaldehyde again and keep 40～70 ℃ of reactions 1.0～2.5 hours, add 1/3rd of 75～90% (weight) solvent at last and keep and till material stirs, got final product discharging in 30～60 minutes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 98122254 CN1105687C (en) | 1998-12-22 | 1998-12-22 | High-molecular cationic flocculant of starch graft acrylamide and its preparing process |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 98122254 CN1105687C (en) | 1998-12-22 | 1998-12-22 | High-molecular cationic flocculant of starch graft acrylamide and its preparing process |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1257840A CN1257840A (en) | 2000-06-28 |
| CN1105687C true CN1105687C (en) | 2003-04-16 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN 98122254 Expired - Fee Related CN1105687C (en) | 1998-12-22 | 1998-12-22 | High-molecular cationic flocculant of starch graft acrylamide and its preparing process |
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| CN100412099C (en) * | 2005-11-07 | 2008-08-20 | 董延茂 | Compound modified starch flocculating agent and equipment thereof |
| CN101343139B (en) * | 2008-08-18 | 2010-04-14 | 哈尔滨工业大学 | Starch type bridging agent and method of preparing the same |
| CN101665554B (en) * | 2009-09-25 | 2011-05-04 | 上海大学 | Preparation method of cationic starch graft copolymer flocculant |
| CN101863540A (en) * | 2010-06-11 | 2010-10-20 | 河北理工大学 | High-selectivity flocculating agent for separating hematite and preparation method thereof |
| CN102225801B (en) * | 2011-04-19 | 2013-03-13 | 湖北省农业科学院农产品加工与核农技术研究所 | Preparation method of cationized carbamate starch water treatment agent |
| CN102408146B (en) * | 2011-08-09 | 2013-06-12 | 山东大学 | Composite bio-flocculant grafted acrylamide flocculant and its preparation method |
| CN103204975A (en) * | 2013-04-27 | 2013-07-17 | 扬州大学 | Preparation method of modified natural high-molecular polymer plain boiled water flocculating agent |
| CN105061675A (en) * | 2015-03-24 | 2015-11-18 | 西北大学 | Starch flocculant, preparation method and applications thereof |
| CN104804139A (en) * | 2015-05-21 | 2015-07-29 | 南京大学 | Flocculation sterilization difunctional grafting starch water treatment agent and preparation method thereof |
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| CN105174397A (en) * | 2015-09-02 | 2015-12-23 | 韩功篑 | Composite polymer sewage treatment flocculant and preparation method thereof |
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| CN106277250A (en) * | 2016-08-31 | 2017-01-04 | 赵卫平 | A kind of process technique of coal washing waste water |
| CN106883349B (en) * | 2017-02-07 | 2019-02-22 | 广西科学院 | A kind of preparation method of flocculant and the application of flocculant |
| CN108394980A (en) * | 2018-04-12 | 2018-08-14 | 王建玲 | A kind of green flocculant for sewage disposal |
| CN109851093A (en) * | 2019-01-24 | 2019-06-07 | 温州泽荣建设工程有限公司 | A kind of energy-saving and emission-reducing town sewage treatment system |
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1998
- 1998-12-22 CN CN 98122254 patent/CN1105687C/en not_active Expired - Fee Related
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| CN1257840A (en) | 2000-06-28 |
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